Only newly added dependencies needs to be considered. For each of these deps
check if there is a path from this dep to the current HEAD.
Use recursive_dep() for this task. Even if recursive_dep() uses a DFS-like
traversal it will not run into an infty-loop if there would be a cycle, because
recursive_dep() takes .topdeps only from committed trees. And it is required
that the committed dependency graph is acyclic.
Signed-off-by: Bert Wesarg <bert.wesarg@xxxxxxxxxxxxxx>
---
hooks/pre-commit.sh | 30 ++++++++++++++++++++++++++++--
1 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/hooks/pre-commit.sh b/hooks/pre-commit.sh
index 9d677e9..8e05a4e 100644
--- a/hooks/pre-commit.sh
+++ b/hooks/pre-commit.sh
@@ -20,7 +20,8 @@ tg_util
if head_=$(git symbolic-ref -q HEAD); then
case "$head_" in
refs/heads/*)
- git rev-parse -q --verify "refs/top-bases${head_#refs/heads}" >/dev/null || exit 0;;
+ head_="${head_#refs/heads/}"
+ git rev-parse -q --verify "refs/top-bases/$head_" >/dev/null || exit 0;;
*)
exit 0;;
esac
@@ -35,4 +36,29 @@ fi
[ -s "$root_dir/.topmsg" ] ||
die ".topmsg is missing"
-# TODO: Verify .topdeps for valid branch names and against cycles
+check_cycle_name()
+{
+ [ "$head_" != "$_dep" ] ||
+ die "TopGit dependencies form a cycle: perpetrator is $_name"
+}
+
+# only check newly added deps
+# check if a path exists to the current HEAD
+git diff --cached "$root_dir/.topdeps" |
+ awk '
+BEGIN { in_hunk = 0; }
+/^@@ / { in_hunk = 1; }
+/^\+/ { if (in_hunk == 1) printf("%s\n", substr($0, 2)); }
+/^[^@ +-]/ { in_hunk = 0; }
+' |
+ while read newly_added; do
+ # deps can be non-tgish but we can't run recurse_deps() on them
+ ref_exists "refs/top-bases/$newly_added" ||
+ continue
+ # recurse_deps uses dfs but takes the .topdeps from the tree,
+ # therefor no infty-loop in the cycle-check
+ no_remotes=1 recurse_deps check_cycle_name "$newly_added"
+ done
+
+
+# TODO: Verify .topdeps for valid branch names
--
tg: (99f2ef6..) bw/check-for-dep-cycle (depends on: master)
--
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